FreeCalypso > hg > gsm-codec-lib
view frtest/cod2std.c @ 477:4c9222d95647
libtwamr encoder: always emit frame->mode = mode;
In the original implementation of amr_encode_frame(), the 'mode' member
of the output struct was set to 0xFF if the output frame type is TX_NO_DATA.
This design was made to mimic the mode field (16-bit word) being set to
0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends
on this struct member being set in any way, and amr_frame_to_tseq()
generates the needed 0xFFFF on its own, based on frame->type being equal
to TX_NO_DATA.
It is simpler and more efficient to always set frame->mode to the actual
encoding mode in amr_encode_frame(), and this new behavior has already
been documented in doc/AMR-library-API description in anticipation of
the present change.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 18 May 2024 22:30:42 +0000 |
parents | 25649b3a83e9 |
children |
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/* * This program reads an FR codec parameters file in ETSI *.cod test sequence * format and converts it into classic libgsm format. */ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include "../libgsmfr2/tw_gsmfr.h" static void bytes_to_params(bytes, params, big_endian) uint8_t *bytes; int16_t *params; { uint8_t *sp; unsigned n; uint16_t val; sp = bytes; for (n = 0; n < 76; n++) { if (big_endian) val = ((uint16_t) sp[0] << 8) | ((uint16_t) sp[1]); else val = ((uint16_t) sp[1] << 8) | ((uint16_t) sp[0]); params[n] = val; sp += 2; } } main(argc, argv) char **argv; { char *infname, *outfname; FILE *inf, *outf; int big_endian; unsigned frame_no; uint8_t input_bytes[76*2], frame[33]; int16_t params[76]; int cc; if (argc == 3 && argv[1][0] != '-') { big_endian = 0; infname = argv[1]; outfname = argv[2]; } else if (argc == 4 && !strcmp(argv[1], "-b")) { big_endian = 1; infname = argv[2]; outfname = argv[3]; } else { fprintf(stderr, "usage: %s [-b] input.cod output.gsm\n", argv[0]); exit(1); } inf = fopen(infname, "r"); if (!inf) { perror(infname); exit(1); } outf = fopen(outfname, "w"); if (!outf) { perror(outfname); exit(1); } for (frame_no = 0; ; frame_no++) { cc = fread(input_bytes, 2, 76, inf); if (cc == 0) break; if (cc != 76) { fprintf(stderr, "error: short read from %s\n", infname); exit(1); } bytes_to_params(input_bytes, params, big_endian); gsmfr_pack_from_array(params, frame); fwrite(frame, 1, sizeof frame, outf); } fclose(outf); exit(0); }